2019 Cadillac ATS Radiator Fan Isn't Working

Radiator fan not working in 2019 Cadillac ATS: causes and solutions

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Reviewed by
Bo Fader
Written by RepairPal Car Genius
Updated January 14, 2025
0%
34% chance it's the
Fan Motor or Clutch
0%
28% chance it's the
Fan Relay or Fuse
0%
23% chance it's the
Temp Sensor or Fan Control Module
0%
15% chance it's
Something else
The most common reasons a 2019 Cadillac ATS radiator fan isn't working are the fan assembly, the fan clutch, or the coolant temperature sensor.
  • Fan Motor or Clutch: A faulty fan motor or a malfunctioning fan clutch can result in inadequate cooling, causing the engine to overheat.
  • Fan Relay or Fuse: A faulty fan relay or blown fuse can prevent the cooling fan from operating, leading to engine overheating.
  • Temp Sensor or Fan Control Module: A faulty temperature sensor or fan control module can result in incorrect readings, causing the engine to overheat or the cooling fan to operate improperly.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2019 Cadillac ATS radiator fan isn't working?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Over time serpentine belts stretch, crack, and the ribs that ride on the accessory pulleys being to wear smooth. A squealing noise that increases with engine speed or as engine driven accessories are turned on may be noted. The noise is caused by the belt slipping on the pulleys, insufficiently driving them. Ineffective air conditioning, a battery warning light, or intermittent power steering assist can result from this.

»MORE: Symptoms of a bad serpentine belt

When the engine coolant temperature sensor fails, it will send inaccurate information to the vehicle’s computer, causing the computer to react to false operating conditions. This will cause the engine to consume more fuel than normal, depleting fuel mileage, and causing black, sooty smoke from the engine under moderate to heavy acceleration. The check engine light will illuminate, and on-board diagnostic trouble codes may be stored for exhaust and emission system failure, fuel delivery system failure, and engine cooling system failure. Overheating may also occur, as the coolant sensor may be leaking fluid out of the engine, creating a an air pocket in the system.

When the radiator fans stop functioning properly, the engine temperature will rise. The spike in temperature will be highest when the vehicle is idling at a stop, but should subside once the vehicle begins moving again.

Additionally, the air conditioner typically won't blow as cold. This is because the air from the radiator fans also blows across the air conditioning condenser, so when the fans fail, both systems suffer.

You'll also usually see the check engine light and notice a drop in fuel economy. It's possible the fan will start making noise if it's failing, as well.

What are the initial diagnostic steps to take when the radiator fan isn't working on a 2019 Cadillac ATS?

When faced with a non-functioning radiator fan in a 2019 Cadillac ATS, it's essential to adopt a systematic diagnostic approach. Begin by checking the fuse associated with the radiator fan, as a blown fuse is a common and easily fixable issue. If the fuse is intact, proceed to inspect the relay that controls the fan; a malfunctioning relay can disrupt the fan's operation. Next, test the fan motor itself to confirm it is receiving power; if not, there may be a wiring issue or the motor could be faulty. Additionally, ensure that the coolant level is sufficient, as low coolant can prevent the fan from engaging properly. Utilizing a diagnostic scanner to check for error codes can provide insights into any underlying problems within the cooling system. Finally, examine the temperature sensor, which is crucial for activating the fan when the engine reaches a certain temperature. By following these steps, you can effectively diagnose and potentially resolve the radiator fan issue on your Cadillac ATS, saving time and money on professional repairs.

What are the common problems that could cause the radiator fan to stop working in a 2019 Cadillac ATS?

When diagnosing why the radiator fan in a 2019 Cadillac ATS has stopped working, it's crucial to consider several common problems that could be at play. A faulty fan motor is often the primary suspect, as it can fail to spin, leading to engine overheating. Additionally, a blown fuse in the fan circuit can cut off power to the fan, rendering it inoperative. Another potential issue is a defective relay, which is responsible for sending the electrical signal to the fan; if this component fails, the fan won't receive the necessary power to operate. Furthermore, a malfunctioning coolant temperature sensor may not activate the fan when the engine reaches high temperatures, exacerbating overheating issues. Lastly, wiring problems, such as damaged or corroded connections, can disrupt the electrical flow to the fan. Addressing these issues promptly is essential to prevent further engine damage, and while some DIY enthusiasts may feel comfortable troubleshooting these components, consulting a qualified mechanic for a thorough inspection is advisable for a definitive diagnosis and repair.

How urgent is it to repair the non-working radiator fan in a 2019 Cadillac ATS to prevent engine overheating?

Repairing a non-working radiator fan in a 2019 Cadillac ATS is an urgent matter that should not be overlooked. The radiator fan is essential for regulating the engine's temperature by dissipating heat generated during operation. When this component fails, the engine is at risk of overheating, which can lead to severe damage, including blown head gaskets and damaged pistons. Such issues not only result in costly repairs but can also culminate in complete engine failure, necessitating a full replacement. Additionally, a malfunctioning radiator fan can hinder the vehicle's overall performance and fuel efficiency, as the engine struggles to maintain its optimal operating temperature. Therefore, addressing the issue of a non-working radiator fan promptly is crucial for ensuring the longevity and reliability of your Cadillac ATS, safeguarding against the significant risks associated with engine overheating.

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2019 Cadillac ATS Radiator Fan Issues: Causes & Repairs